Questions tagged [hvac]
(Heating, Ventilating, and Air Conditioning) For questions about installing, repairing, and troubleshooting HVAC systems.
1
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0answers
18 views
My induction blower never stops
My induction blower never stops. It was showing a code of pressure switch but if I turned off the main power and then back on it would reset and heat normally till it was up to temp then shut off and ...
1
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1answer
14 views
TRANE XE70 GAS FURNACE - HSI only works once
My TRANE XE70 Gas Heater ..... HSI will glow hot once and heater works fine but then doesn't work anymore on the Thermostat cycle.
I've replaced Flame Sensor and HSI Module.
My White-Rodgers Control ...
1
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1answer
13 views
Heil gas Furnace — water in the pressure switch vacuum hose
Every few days I have to remove and drain the the rubber tube from the pressure switch to the furnace or it won't ignite. Why is water condensing in that tube? It's not a hard thing to fix-- but I ...
1
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1answer
13 views
How to connect c-wire to Burnham Series 2 boiler?
I am trying to install my ecobee 3 light but the previous thermostat did not use any c wire. Fortunately, there was an unused wire in the wall and I would like to set it up as a c-wire. The problem is ...
0
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1answer
15 views
How to improve heating/AC flow in second floor?
We moved into our house about a year ago and the second floor in my house never get enough heat in winter or cold AC in the summer. Our first floor can be a 72F deg while our upstair stays at nearly ...
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0answers
14 views
Why would the main blower come on immediately with a call for heat from the stat?
I am trying to help out a neighbor. The initial problem was that the furnace wasn't working. The error code was a bad limit switch. The neighbor replaced all of the limit switches but the furnace ...
0
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0answers
22 views
Daikin Mini Split Runs Constantly
We had a Daikin ductless system installed as a replacment for our old system that finally died. We have 4 total units inside the house, with 1 in each of the 3 upstairs bedrooms and a larger 18K BTU ...
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0answers
10 views
Hvac blower motor stopped running but furnace kept running, fixed now
Is there a safety device I can add to my Gibson system? The smaller copper line got real hot! The heat pump was still running too. 3 years ago they did add a pressure switch to the end of 1/4" copper ...
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0answers
8 views
Oil furnace cmf280-pg convertible problems
Cmf2 80-po convertible with a auto limit switch and a manual aux limit switch. Furnace will run a heat cycle to desired temp but then blower fan runs to cool furnace in 4 very short 3 second spurts. ...
0
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1answer
13 views
Where should my furnace filter go in a Lennox G40UH24A045 series furnace (Merit)?
I cannot find the filter and my furnace is not providing any heat.
The limit switch is working fine as is the flame sensor.
Diagnostic lights are: 1 slow bling 2 on
Any clues?
Thanks
1
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1answer
41 views
Old thermostat to Hive thermostat
My wife decided we needed a smart thermostat... which means I need to install said thermostat...
Currently a Bryant Evolution series is mounted. She purchased the Hive with Hub when it was on sale.
...
0
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0answers
13 views
how to communicate thermostat to turn on wood heat system when during heat pump defrost cycle
I have physically disconnected the strip heaters in my air handler but the fan still runs which I do not want. I have a wood boiler I want to run in place of the aux heat
Can I disconnect the white ...
1
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1answer
40 views
How can I prevent makeup air vents from exhausting conditioned air?
The utility room has two 8-10 inch ducts running to it from the exterior of the home. There are also three fireplaces in the home, and we have noticed that occasionally the house smells like smoke, ...
1
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2answers
46 views
How do I install flex duct to existing duct including registers
When my home was built in 2016 the HVAC runs from the furnace in the basement up through the house uses 7" R4.2 insulated flex duct.
I am in the process of finishing my basement and I would like to ...
0
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0answers
19 views
My furnace blower will not turn on when on when in E-heat mode with auto fan
I have an electric furnace Carrier model FB4ANF030. I enclosed the wiring diagram.
Issue:
The blower fan will not turn on automatically when the thermostat is set to "Emergency heat" and "Fan Auto". ...
0
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0answers
10 views
Hvac electric furnace Nordyne E1EH-012HA
I have a problem with Nordyne electric furnace with A/c coil above. It started the winter short cycling, then did nothing.
I became a YouTube maniac trying to figure out the problem. I first replaced ...
0
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2answers
50 views
Tankless hot water to heat home
I have a 1200 square foot second floor apartment that is presently heated using a forced hot water radiator system. The system is called a Paloma "Paloma Pak" heating system. It is basically a ...
1
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0answers
24 views
Can I use an available wire as a C-wire by adding it to an unoccupied 24v terminal?
I want to add new thermostats in my home. Luckily, the wiring to my thermostat has an unused wire in the bundle for the required "C-Wire". It has R,G,Y,W, and an unused blue. The thermostat wiring ...
3
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1answer
30 views
Can't find HVAC C terminal
Could any of these be the c terminal on my hvac unit? There's already a c wire there, just can't figure out where to connect it.
1
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1answer
24 views
2 Air Filters in Air Conditioning Unit
My air conditioning system has a 2-layered (each 1") filter holder, definitely made for two filters. My idea, to improve the filter life and have the least air flow restriction, is to have the initial ...
0
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0answers
15 views
How to dimension air ducts for a combination heater/HRV?
I am looking at this product (version RK5) for both heat recovery ventilation and supplementary heating via warm air (seasonally).
It has an extra inlet for air recirculation, which it can mix with ...
2
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1answer
29 views
How can I deal with a heat pump condenser producing lots of water?
Heat pumps was replaced in 2017. North Florida has had moderately cool weather (50-60 degrees F) recently. I noticed water underneath one of the units.
Is the water pooling normal? If yes, why?
If ...
1
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0answers
23 views
Solar panel as a hatch and Is sleeping under a solar panel safe?
I'm looking to build a very large custom roof hatch/vent on my van. I was going to make to top out of Lexan, but then I realized I might want a large solar panel on the roof as well. I was looking at ...
0
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0answers
20 views
Fan Blows Constantly Even With C Wire
Nest stated that my furnace only set up (we have an evap cooler) would work with their Nest E product. I self installed only two wires, R and W. The heating works; however, the fan always blows ...
0
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0answers
19 views
Fan only mode not turning on blower - 2 wire blower
Our manufactured home has a colman furnace and for heating it works fine. I would like to use the fan only mode when we have the fire place going but it is not hooked up, and I just want to make sure ...
0
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2answers
29 views
Can I upsize my air conditioner if I have a two-speed compressor?
The upper floor of my house has a split A/C, three-ton. When the temperature gets up above about 95 Fahrenheit, the unit can't keep the upstairs cool. That means that for a few weeks a year, my kids'...
0
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0answers
24 views
Is an alcohol-based spray cleaner ok for cleaning an aluminum AC evaporator coil?
Simple alcohols such as ethanol can, apparently, corrode aluminum. However, this corrosion reaction seems to be very slow at room temperature and below. Is an ethanol based, non-foaming spray cleaner, ...
1
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1answer
23 views
Zone Controller T-Stat Wiring w/ 24V transformer, isolation relays for 2 zones
I have a new Navien SmartZone+ 6-Zone Control for my boiler-based heating system. It is great, except it provides no power on C.
I realize the internet has researched the heck out of adding a C ...
0
votes
0answers
26 views
Why does the compressor continue to run after the fan is switched off?
I have a split system with two fan motors running from one compressor. When I turned off the fan motor, the compressor kept running. I couldn't turn it off, even when I went to the electricity board ...
0
votes
1answer
52 views
Why is my steam radiator rattling like this, and what can I do about it?
I have one-pipe steam radiators in a home built in 1905 (condoized in 1998). Only one of the radiators, the largest, makes this awful rattling sound when the system heats up:
https://youtu.be/...
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0answers
13 views
Coleman Wall furnace in 1967 mobile home gas model # 8670A
My old wall gas furnace blower motor keeps running and shutting off not cooling the system down and smells hot inside and outside?
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0answers
19 views
Nest thermostat installation to furnace and heat pump
We have
T874G1196 thermostat by york (can only find honeywell documentation)
MB7BM-1200K-B air handler
H8HK015H-21 electric heater
Thermopump (heating and cooling)
We want to connect it to a nest ...
0
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0answers
14 views
Replacing Flame Sensor on Ruud Silhouette Furnace
I'm quite new when it comes to looking at furnaces. The furnace in my house recently started shutting off before getting to the temperature the thermostat is set to. Eventually we'd reset the whole ...
18
votes
2answers
5k views
Half my house losing power, HVAC the key factor
For the past couple of weeks I have been losing power occasionally to half my house. My central AC goes out, half my kitchen, living room and my kids' rooms. There are no tripped breakers though.
I ...
0
votes
1answer
15 views
How to fix A0 error code of a Daikin split system air conditioner
When I tried to turn on my split system AC today, the indicator light just kept blinking and the air conditioning was not on.
Here is the error code as displayed on the remote
According to what I ...
0
votes
0answers
10 views
Open ceiling duct in finished basement
Moved into a new house that was only used as a summer home and had a portion of the basement finished. They tapped into existing duct work from my HVAC system to run into the finished area but bc it's ...
0
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3answers
46 views
How to seal joints in ductwork when tape is not an option
The duct-work in the basement for my forced air heating system has been modified at various points over its long history and as a result had quite a few leaks when I moved in recently. I used foil ...
0
votes
1answer
5 views
Draft Inducer replacement motor part number
The draft inducer motor in my Payne furnace started making a whining sound the other night, so I ordered a replacement from Ebay. My part number is HC21ZE121A, and the motor I got is missing the 'A' ...
1
vote
2answers
33 views
Is there harm in using my mini-splits in conjunction with my hot-water baseboard heat?
My new house has a natural gas boiler with three zones of radiant baseboard heat (one per floor). It also has a mini-split system (again one head per floor). The mini-split was advertised as air ...
0
votes
1answer
19 views
Carrier Furnace 58STX110-14122 fan starts the first time, but fails to start at subsequent calls for heat
On a Carrier Furnace model #58STX110-14122, when the initial call for heat comes on, everything works just fine in the following order:
Thermostat sends a call for heat
Draft Inducer motor kicks on
...
0
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0answers
25 views
AC Common wire disappears
On my furnace there is a wire that is labeled C/Common. But at my thermostat there is no common wire.
Wires on furnace control panel:
W - White
Y - Yellow
G - Green
C - Common
Wires at my thermostat:
...
0
votes
2answers
39 views
venting a range hood outside on our cedar cabin
i need to vent our range hood outside on our cedar cabin and it is on the front of the house we would like it to be as inconspicuous as possible I can not find a vent that would work well with a cedar ...
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0answers
64 views
1
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2answers
57 views
Why is this airduct twitching and making a noise?
I have an air duct in my basement. It leads from my furnace (I think?) to the outside world.
However, as you can see from this video, it is "twitching".
Every second or so it jerks slightly and ...
0
votes
1answer
26 views
Bad Limit Switch?
My Nest thermostat is not working and it says the red wire is not getting power. The gas company man poked around the furnace and thinks it is a bad limit switch. Question: can a bad limit switch stop ...
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2answers
49 views
Is 4“ Ducting Used for a 4” Bath Fan?
I'm interested in installing a bath fan and am currently planning ou the project.
The fan specs (https://www.homedepot.com/p/Delta-Breez-GreenBuilder-Series-100-CFM-Wall-or-Ceiling-Bathroom-Exhaust-...
1
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1answer
20 views
Blower turns on and off even though the unit is satisfied
My heater works fine when I set the temperature to 69 and the temperature hits the desired temp it shuts off, then about 2 mins later the blower turns on like the heater is going to start up again, ...
4
votes
4answers
121 views
Best Way to Heat a Ductless Multi-Level Home
I just bought a home and it desperately needs an update to its heating. It currently has baseboard electric resistance heaters in every room. There is no duct-work in the house. We're in cold humid ...
1
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0answers
19 views
HVAC indoor fan stuck buzzing
My old Sanyo SAP-KRV123EHA had a noisy ball bearing in the indoor fan unit. Since Sanyo is no longer making these units I tried replacing the fan bearing with ceramic ones. After assembling the motor, ...
1
vote
1answer
28 views
nest 2nd gen, no common wire/terminal in the fan coil unit
I'm trying to install an older nest in my condo but it immediately complains that there's no common wire attached (error e24). I opened up the fan coil in my condo and there is no specific terminal ...
